It is possible to make a grilled cheese sandwich using just a toaster and not fill it with cheese goo. All you have to do, says the kitchn, is just put the toaster on its side. Place the cheese on top of the bread, slide it in, and the force of gravity keeps it on the bread. Paradigm shift!
Now, you’ll need the right kind of toaster. If it’s the kind that has a wire cage that folds in, that’s no good.
In that case, what you could try is making a quick pouch for the bread and cheese out of parchment paper or foil. Another thing you can do is use a sharp knife, cut a slice in the bread itself, slip the cheese in, and then toast that bad boy.